[Nix-dev] Kernel headers

[Michael Raskin]

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Pjotr Prins wrote:
| I have a basic question. I have created a Kernel_headers expression for
| 2.6.18. How do I override the NIX build without changing:
|
|    kernelHeaders = kernelHeaders_2_6_23;
|
| to:
|
|    kernelHeaders = kernelHeaders_2_6_18;
|
| In other words, what switch to I pass nix-build/nix-env -i to
| ascertain headers 2.6.18 without changing the default line in
| all-packages.nix? I would like to keep the SVN tree generic.

Write something like

kernelHeaders =
~  let kernelHeadersVersion = getConfig
~                               ["kernelHeaders" "version"]
~                               "2.6.23";
~  in
~    if kernelHeadersVersion == "2.6.23" then
~      kernelHeaders_2_6_23 else
~    if kernelHeadersVersion == "2.6.22" then
~      kernelHeaders_2_6_22 else
~    if kernelHeadersVersion == "2.6.18" then
~      kernelHeaders_2_6_18 else
~    abort "Unknown kernelHeaders version.";

I think it will be an acceptable modification to commit.. Better naming
may be needed, though.
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